Three tins, A, B and C, each contain buttons.
Tin A contains x buttons.
Tin B contains 4 times the number of buttons that tin A contains.
Tin C contains 7 fewer buttons than tin A.
The total number of buttons in the three tins is 137
Work out the number of buttons in tin C.
the number of buttons in tin C is 17. x+4x+x-7= 137 combine like terms 6x-7=137 isolate the variable by adding 7 to both sides 6x=144 divide x=24 but remember, tin c is x-7 so plug the 24 in, and the answer is 17.
